LDAPS (secure communication with LDAP) is provided using the SSL/TLS and StartTLS
protocols. Using these protocols allows Hue to validate the directory service with
which it is going to interact. Optionally, specify the path to the certificate for
authentication over TLS in the /etc/hue/conf/hue.ini
file:

# A PEM-format file containing certificates for the CA's that
# Hue will trust for authentication over TLS.
# The certificate for the CA that signed the
# LDAP server certificate must be included among these certificates.
# See more here http://www.openldap.org/doc/admin24/tls.html.
ldap_cert=<path/to/cert/file
use_start_tls=true